Millett Peter J, Miller Bruce S, Close Matthew, Sterett William I, Walsh William, Hawkins Richard J
Steadman Hawkins Sports Medicine Foundation, Vail, Colorado. Harvard Medical School, Brigham & Women's Hospital, Boston, Massachusetts 02115, USA.
Am J Sports Med. 2003 Sep-Oct;31(5):714-7. doi: 10.1177/03635465030310051301.
Anterior cruciate ligament reconstruction is commonly performed with autogenous hamstring tendon grafts.
To ascertain the effects of braiding on ultimate tensile strength and stiffness of hamstring tendon graft.
Controlled laboratory study.
Sixteen fresh-frozen semitendinosus and gracilis tendons were harvested from eight matched (right and left) human cadaveric specimens. Both sets of hamstring tendons from each matched pair were doubled, creating a four-strand graft. Grafts were then randomized so that one graft from each matched pair was braided and the other remained unbraided. The diameter of each graft construct was recorded. Grafts were tested to failure on a materials testing machine.
There were no significant differences in cross-sectional area before or after braiding. Fifteen of 16 tendons failed midsubstance; 1 failed at the lower clamp. Braiding reduced the initial tensile strength and stiffness of human hamstring tendon grafts in this study by 35.0% and 45.8%, respectively.
Braiding may place the collagen fibers in a suboptimal orientation for loading that results in a weaker graft. We do not recommend the use of braiding if the strongest, stiffest initial graft is desired.
前交叉韧带重建通常采用自体腘绳肌腱移植。
确定编织对腘绳肌腱移植最终拉伸强度和刚度的影响。
对照实验室研究。
从8对匹配（左右）的人体尸体标本中获取16条新鲜冷冻的半腱肌和股薄肌腱。将每对匹配标本的两组腘绳肌腱加倍，制成四股移植体。然后将移植体随机分组，使每对匹配标本中的一个移植体进行编织，另一个保持不编织。记录每个移植体结构的直径。在材料试验机上对移植体进行直至破坏的测试。
编织前后的横截面积无显著差异。16条肌腱中有15条在肌腱中部断裂；1条在较低的夹具处断裂。在本研究中，编织使人体腘绳肌腱移植体的初始拉伸强度和刚度分别降低了35.0%和45.8%。
编织可能使胶原纤维处于不利于加载的方向，从而导致移植体较弱。如果需要最强、最硬的初始移植体，我们不建议使用编织。
